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Measuring the middle of a distribution The mean The mode The arithmetic average obtained by adding all the scores and dividing by the total number of scores The score which occurs most frequently
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Cumulative frequency Cumulative frequency table
Cumulative frequency graph
Measuring the middle of a distributionThe mean The modeThe arithmetic
average obtained by adding all the scores and dividing by the total number of scores
The score which occurs most frequently
Middle of a distributionThe medianWhen placed in
order from smallest to largest, the middle score
Find mean mode and median of…a) 3, 6, 5, 4, 5, 5, 6, 7b) 13, 12, 15, 13, 18, 14, 16, 15, 15, 17
PercentilesIn a cumulative
frequency graph….The 25th percentile
is called the lower quartile
The 50th percentile is the middle value (median value)
The 75th percentile is called the upper quartile
The interquartile rangeInterquartile range
= upper quartile – lower quartile
Box and Whisker PlotsA 5 figure visual
display of a data set
The minimum value
The lower quartileThe medianThe upper quartileThe maximum
value
Box and whisker plots
